Which is biotic?
a. wind
b. iron gate
c. sunlight
d. dead leaf

The most appropriate answer would be d. dead leaf.

Biotic component of the ecosystem includes all the living things such as plants, animals, and microorganisms.

Leaf dead or alive should belong to the biotic component of the ecosystem as it was once the part of the plants.

It can be co considered as abiotic once it is completely degraded or broken down into its simpler constituents.

ι вєℓινє тнє αиѕωєя тσ уσυя qυєѕтισи ιѕ в. ℓуѕσѕσмє

ι нσρє тнαт ι ¢συℓ∂ нєℓρ уσυ.